摘要：
The global trend of vegetation "greening" in the context of ecological restoration necessitates an urgent assessment of ecosystem services. As essential components of ecosystem services, the hydraulic functions of soil in infiltrating and retaining water following vegetation restoration remain unclear, especially in subtropical mountainous and hilly areas with complex topographies. From 2018 to 2021, soil moisture data collected at five-minute intervals were monitored for three restoration strategies in a hilly catchment of China's Three Gorges Reservoir area. The restoration strategies included planted forest (PF) and natural restoration (naturally regenerated forest, NF; deforested pasture, DP). The soil moisture response to rainfall under these strategies was evaluated using several metrics, including the time difference between peak rainfall intensity and peak soil moisture response (T-p2p), cumulative infiltration, and occurrence frequency of preferential flow (PRF). The results showed that the average soil moisture content (SMC) of PF was significantly (p < 0.05) lower than that of NF and DP in both dry and wet seasons, regardless of upslope or downslope location. However, the topographic position affected the difference in average SMC between DP and NF. At the downslope location, the average SMC of DP (0.39 cm(3) cm(-3)) was significantly higher than that of NF (0.33 cm(3) cm(-3)). Conversely, at the upslope location, the average SMC of DP (0.27 cm(3) cm(-3)) was lower than that of NF (0.30 cm(3) cm(-3)). These findings suggested that PF had a lower amount of soil water storage than NF and DP, which was supported by the lowest cumulative infiltration in PF during storm events. The response of soil moisture to storms in PF (T-p2p = 3.1 h) was slower than that in NF (T-p2p = 1.9 h) and DP (T-p2p = 2.5 h). This was consistent with the lower occurrence frequency of preferential flow in PF (PRF = 19.2 %) than NF (PRF = 39.2 %) and DP (PRF = 32.9 %). Therefore, longer response time and less preferential flow indicated that the PF had a relatively poor soil moisture responsiveness to storm events. Accordingly, this study highlights the insufficiency of afforestation in soil water infiltration and retention compared to natural restoration, meriting consideration when assessing soil hydraulic functions in vegetation restoration areas.
摘要：
CsPbBr(3) has received more and more attention in the field of optoelectronic devices due to its excellent stability. To address the cost and environmental concerns associated with the use of toxic methanol, water has been explored as a substitute solvent for CsBr in the preparation of CsPbBr(3) perovskite solar cells (PSCs). In this study, we utilized methanol as an anti-solvent of the CsBr/H(2)O solution to regulate the detrimental effects of water on the CsPbBr(3) film and control the crystallization process. From results of the experiment, it was found that methanol anti-solvent treatment greatly improved the crystallization of the CsPbBr(3) film, increased the grain size, and reduced the defect density. After the introduction of methanol anti-solvent treatment, the power conversion efficiency (PCE) increased from 6.09% to 7.91%, while the open-circuit voltage (V(oc)) increased from 1.18 V to 1.39 V. Furthermore, we incorporated 2-hydroxyethylurea into the CsPbBr(3) PSCs to improve the wettability of PbBr(2) towards the CsBr/H(2)O solution and ensure the formation of pure-phase CsPbBr(3) films. The introduction of 2-hydroxyethylurea resulted in an additional increase in V(oc) from 1.19 V to 1.42 V. The PCE further improved from 6.56% to 8.62% after methanol anti-solvent treatment. These results demonstrate that methanol treatment effectively addresses the low V(oc) issue observed in CsPbBr(3) PSCs prepared with water as a solvent. Importantly, this approach significantly reduces the reliance on methanol compared to conventional fabrication methods for CsPbBr(3) PSCs. Overall, this work presents a promising pathway for achieving high V(oc) and efficiency in CsPbBr(3) PSCs by utilizing water as a solvent.
期刊：
Expert Systems with Applications,2024年244:123004 ISSN：0957-4174
通讯作者：
Wang, ZF
作者机构：
[Chen, Zengzhao; Wang, Zhifeng; Zheng, Qiuyu; Liu, Hai; Lin, Mengting] Cent China Normal Univ, Fac Artificial Intelligence Educ, Wuhan 430079, Peoples R China.;[Liu, Hai] Cent China Normal Univ, Natl Engn Res Ctr Educ Big Data, Wuhan 430079, Peoples R China.
通讯机构：
[Wang, ZF ] C;Cent China Normal Univ, Fac Artificial Intelligence Educ, Wuhan 430079, Peoples R China.
摘要：
Transformer models have demonstrated superior performance across various domains, including computer vision, natural language processing, and speech recognition. The success of these models can be attributed to their robust parallel capacity and high computation speed, primarily reliant on the attention layer. In the domain of speaker recognition, state-of-the-art results have been achieved using convolutional neural network (CNN) architectures, particularly with speaker embeddings represented by x-vectors and r-vectors. However, existing CNN-based methods tend to focus on local features while overlooking the global dependence of voiceprint features, resulting in the loss of crucial information. Moreover, the presence of noise in audio data is an influential factor that cannot be disregarded, as it significantly impacts the extraction of discriminative speaker embeddings. To address these challenges, we propose a novel model called the Multi-Scale Expand Convolution Transformer (MEConformer). This model aims to convert variable-length audio into a fixed low-dimensional representation. The MEConformer leverages a CNN framework with expanded receptive fields to capture frame-level features effectively. Additionally, we introduce a transformer encoder that incorporates contextual dependencies, enabling the extraction of both frame-level and discourse -level feature representations. Furthermore, we present a multi-scale residual aggregation strategy, which facilitates the efficient transmission of voiceprint information across the model. By combining these innovative components, the MEConformer achieves a state-of-the-art Equal Error Rate (EER) of 3.72% on the VoxCeleb1 test set. Furthermore, it demonstrates EERs of 5.94% and 3.72% on the VoxCeleb1-H and VoxCeleb-E datasets, respectively. The code for the proposed MEConformer model will be made publicly available at https://codeocean.com/capsule/4563012/tree.
摘要：
This paper explores the knowledge network structure of foreign research literature by applying the qualitative comparative analysis (QCA) method to the field of information science and library science (ISLS) from the perspective of the cocitation of social network actors such as authors, institutions, countries, and literature, and it further reveals the future application trends of this method. [Method/process] Based on 86 journals in the ISLS field that were downloaded from the Web of Science using the QCA method, the social network analysis (SNA) method and the visual analysis tool Gephi are used to analyse the author cooperation network, the research institution cooperation network, the national cooperation network, the cocitation network, the cutting-edge trends, etc., of journal papers. The analysis shows that the QCA method covers a wide range within the field of ISLS, but the research topics involved in this field are not concentrated, and the author cooperation network has scale-free characteristics. The application of the QCA method is still dominant in European and American countries, and China, the USA, and Italy all play key roles in the national cooperation network. Finally, the institutional cooperation network has certain small group attributes.
摘要：
Poly(ionic liquid)s (PILs) bearing high ionic densities are promising candidates for carbon dioxide (CO(2)) fixation. However, efficient and metal-free methods for boosting the catalytic efficiencies of PILs are still challenging. In this study, a novel family of poly(ionic liquid)-coated carbon nanotube nanoarchitectures (CNTs@PIL) were facilely prepared via a noncovalent and in-situ polymerization method. The effects of different carbon nanotubes (CNTs) and PILs on the structure, properties, and catalytic performance of the composite catalysts were systematically investigated. Characterizations and experimental results showed that hybridization of PIL with hydroxyl- or carboxyl-functionalized CNTs (CNT-OH, CNT-COOH) endows the composite catalyst with increased porosity, CO(2) capture capacity, swelling ability and diffusion rate with respect to individual PIL, and allows the CNTs@PIL to provide H-bond donors for the synergistic activation of epoxides at the interfacial layer. Benefiting from these merits, the optimal composite catalyst (CNT-OH@PIL) delivered a super catalytic efficiency in the cycloaddition of CO(2) to propylene oxide, which was over 4.5 times that of control PIL under metal- and co-catalyst free conditions. Additionally, CNT-OH@PIL showed high carbon dioxide/nitrogen (CO(2)/N(2)) adsorptive selectivity and could smoothly catalyze the cycloaddition reaction with a simulated flue gas (15% CO(2) and 85% N(2)). Furthermore, the CNT-OH@PIL exhibited broad substrate tolerance and could be readily recycled and efficiently reused at least 12 times. Hybridization of PIL with functionalized CNTs provides a feasible approach for boosting the catalytic performance of PIL-based solid catalysts for CO(2) fixation.
摘要：
Nanozymes with peroxidase (POD)-like activity have garnered significant attention due to their exceptional performance in colorimetric assays. However, nanozymes often possess oxidase (OD) and POD-like activity simultaneously, which affects the accuracy and sensitivity of the detection results. To address this issue, inspired by the catalytic pocket of natural POD, a single-atom nanozyme with FeN(5) configuration is designed, exhibiting enhanced POD-like activity in comparison with a single-atom nanozyme with FeN(4) configuration. The axial N atom in FeN(5) highly mimics the amino acid residues in natural POD to optimize the electronic structure of the metal active center Fe, realizing the efficient activation of H(2)O(2). In addition, in the presence of both H(2)O(2) and O(2), FeN(5) enhances the activation of H(2)O(2), effectively avoiding the interference of dissolved oxygen in colorimetric sensing. As a proof-of-concept application, a colorimetric detection platform for uranyl ions (UO(2)(2+)) in seawater is successfully constructed, demonstrating satisfactory sensitivity and specificity.
期刊：
Neural Computing and Applications,2024年 ISSN：0941-0643
通讯作者：
Qu, SC
作者机构：
[Qu, Shaocheng; Zheng, Wei; Tang, Qian] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Zheng, Wei] Kashi Univ, Coll Phys & Elect Engn, Kashi 844000, Xinjiang, Peoples R China.
通讯机构：
[Qu, SC ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
关键词：
Cellular neural network;Memristor;Sliding mode control;Chaotic synchronization;Secure communication
摘要：
The purpose of this research is to investigate the synchronization and control for uncertain memristor-based cellular neural network and its application in secure communication. To address the issue, a novel sliding mode function is designed, on which the system states can effectively converge to the equilibrium point after reaching the sliding mode surface. Moreover, the corresponding controller is constructed by employing the proposed sliding mode function. The proposed control strategy achieves the synchronization of the uncertain memristor-based cellular neural network, and effectively addresses the integral saturation existing in traditional one. In addition, the control performance, including convergence speed, control accuracy, robustness and security, are significantly enhanced. Furthermore, the stability of the system is discussed based on Lyapunov theory. Finally, comparative tests and application examples are presented to verify the effectiveness of the proposed scheme.
期刊：
Sensors and Actuators B-Chemical,2024年405 ISSN：0925-4005
通讯作者：
Xu, Miao;Gu, WL;Ye, HR
作者机构：
[Xu, Weiqing; Chen, Yifeng; Zhu, Chengzhou; Xu, Miao; Sha, Meng; Zou, Chufan; Gu, Wenling; Chen, Guo] Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;[Ye, Huarong; Ye, HR] China Resources & Wisco Gen Hosp, Wuhan 430080, Peoples R China.;[Zhu, Chengzhou] Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Key Lab Organosilicon Chem & Mat Technol, Minist Educ, Hangzhou 311121, Peoples R China.;[Gu, Wenling] Hubei Univ, Sch Life Sci, State Key Lab Biocatalysis & Enzyme Engn, Wuhan 430062, Peoples R China.
通讯机构：
[Xu, M; Gu, WL ; Ye, HR ] C;Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;China Resources & Wisco Gen Hosp, Wuhan 430080, Peoples R China.;Hubei Univ, Sch Life Sci, State Key Lab Biocatalysis & Enzyme Engn, Wuhan 430062, Peoples R China.
摘要：
The fragility inherent in enzymes can be overcome by immobilizing them within nano-carriers, which offer designability and controllability and serve as a promising strategy for overcoming the inherent fragility of enzymes. While enzyme immobilization enhances enzyme stability and reusability, it can potentially hinder their bioactivity and catalytic efficiency. In this study, we present an enzyme-directed biomimetic mineralization approach for the in situ encapsulation of horseradish peroxidase (HRP) within hydrogen-bonded organic frameworks (HOFs) to obtain HOF@HRP nanocomposites. Remarkably, the HOF@HRP nanocomposites exhibit an ultrahigh protein content and demonstrate comparable catalytic activity to that of the free enzyme. Moreover, the HOFs act as protective shields, safeguarding the internal enzymes against various environmental disturbances. Leveraging the unique properties of HOF@HRP, we propose a dual-modal enzyme-linked immunosorbent assay for the sensitive detection of prostate-specific antigen in human serum. The resultant biosensor exhibits a good linear range, excellent sensitivity, and selectivity, showcasing its promising potential and clinical application in the field of diagnostic medicine.
摘要：
In mm -wave massive multiple -input -multiple -output (MIMO) systems, accurate channel state information (CSI) at the base station (BS) is the key knowledge to obtain the performance gain. Consequently, the user is not only required to complete the channel estimation, but also to feedback CSI to the BS. However, large-scale antenna arrays result in a substantial feedback overhead, which poses a challenging issue. Furthermore, the accuracy requirements of channel estimation and CSI feedback depend on the computing capacity of the user. In this paper, we propose a joint channel estimation and multiple -compression -rate feedback (JCEMF) scheme, and adopt centralized learning (CL) and federated learning (FL) strategies for the scheme. According to the limited computational resources available to users, the JCEMF scheme enables various lengths of feedback bits to change the feedback overhead. Additionally, the users in FL train the local models using their own datasets and upload the local model updates to the BS, thereby reducing communication overhead and protecting data privacy. Specifically, an estimation network is designed for the user to estimate the channel from the received signal. In the CSI feedback process, we introduce an MCRF network, which can achieve CSI compression and reconstruction with different numbers of feedback bits. Simulation results verify that the proposed approach shows good performance of joint channel estimation and multiple -compression -rate CSI feedback in different channel conditions.
摘要：
Subspace codes have important applications in random network coding. It is a classical problem to construct subspace codes where both their size and their minimum distance are as large as possible. In particular, cyclic constant dimension subspace codes have additional properties which can be used to make encoding and decoding more efficient. In this paper, we construct large cyclic constant dimension subspace codes with minimum distances 2k-2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$2k-2$$\end{document} and 2k. These codes are contained in Gq(n,k)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathscr {G}_q(n, k)$$\end{document}, where Gq(n,k)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathscr {G}_q(n, k)$$\end{document} denotes the set of all k-dimensional subspaces of the finite filed Fqn\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathbb {F}_{q<^>n}$$\end{document} of qn\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$q<^>n$$\end{document} elements (q a prime power). Consequently, some results in [7, 15], and [23] are extended.
作者机构：
[Zhu, Chengzhou; Gu, Wenling; Li, Jingshuai; Xi, Mengzhen] Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;[Hu, Liuyong] Wuhan Inst Technol, Hubei Engn Technol Res Ctr Optoelect & New Energy, Hubei Key Lab Plasma Chem & Adv Mat, Wuhan 430205, Peoples R China.;[Sun, Hongcheng] Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Key Lab Organosilicon Chem & Mat Technol, Minist Educ, Hangzhou 311121, Peoples R China.;[Gu, Wenling] Key Lab Opt Elect Sensing & Analyt Chem Life Sci, MOE, Qingdao 266042, Peoples R China.
通讯机构：
[Gu, WL ] C;Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;Key Lab Opt Elect Sensing & Analyt Chem Life Sci, MOE, Qingdao 266042, Peoples R China.
摘要：
Improving the sensitivity in electrochemiluminescence (ECL) detection systems necessitates the integration of robust ECL luminophores and efficient signal transduction. In this study, we report a novel ECL nanoprobe (Zr-MOF) that exhibits strong and stable emission by incorporating aggregation-induced emission ligands into Zr-based metal-organic frameworks (MOFs). Meanwhile, we designed a high-performance signal modulator through the implementation of a well-designed controlled release system with a self-on/off function. ZnS quantum dots (QDs) encapsulated within the cavities of aminated mesoporous silica nanoparticles (NH(2)-SiO(2)) serve as the ECL quenchers, while adenosine triphosphate (ATP) aptamers adsorbed on the surface of NH(2)-SiO(2) through electrostatic interaction act as "gatekeepers." Based on the target-triggered ECL resonance energy transfer between Zr-MOF and ZnS QDs, we establish a coreactant-free ECL aptasensor for the sensitive detection of ATP, achieving an impressive low detection limit of 0.033 nM. This study not only demonstrates the successful combination of ECL with controlled release strategies but also opens new avenues for developing highly efficient MOFs-based ECL systems.
作者机构：
[Deng, Yi; Wang, Lei; Deng, Y] Wuhan Text Univ, Sch Elect & Elect Engn, Wuhan 430200, Peoples R China.;[Deng, Yi; Deng, Y] Wuhan Text Univ, State Key Lab New Text Mat & Adv Proc Technol, Wuhan 430200, Peoples R China.;[Li, Yitong] Hankou Univ, Sch Elect & Informat Engn, Wuhan 430212, Peoples R China.;[Liu, Hai] Cent China Normal Univ, Fac Artificial Intelligence Educ, 152 Luoyu Rd, Wuhan 430079, Peoples R China.;[Wang, Yifei; Wang, YF] Wuhan Univ Sci & Technol, Sch Informat Sci & Engn, Wuhan 430081, Peoples R China.
通讯机构：
[Wang, YF ; Deng, Y ] W;Wuhan Text Univ, Sch Elect & Elect Engn, Wuhan 430200, Peoples R China.;Wuhan Text Univ, State Key Lab New Text Mat & Adv Proc Technol, Wuhan 430200, Peoples R China.;Wuhan Univ Sci & Technol, Sch Informat Sci & Engn, Wuhan 430081, Peoples R China.
关键词：
channel attention mechanism;all phase;harmonic detection;electric energy measurement
摘要：
The core of harmonic detection is the recognition and extraction of each order harmonic in the signal. The current detection methods are seriously affected by the fence effect and spectrum aliasing, which brings great challenges to the detection of each order harmonic in the signal. This paper proposes an efficient harmonic detection neural network based on all-phase processing. It is based on three crucial designs. First, a harmonic signal-processing module is developed to ensure phase invariance and establish the foundation for subsequent modules. Then, we constructed the backbone network and utilized the feature-extraction module to extract deep abstract harmonic features of the target. Furthermore, a channel attention mechanism is also introduced in the weight-selection module to enhance the energy of the residual convolution stable spectrum feature, which facilitates the accurate and subtle expression of intrinsic characteristics of the target. We evaluate our method based on frequency, phase, and amplitude in two environments with and without noise. Experimental results demonstrate that the proposed EhdNet method can achieve 94% accuracy, which is higher than the compared methods. In comparison experiments with actual data, the RMSE of EhdNet is also lower than that of other recent methods. Moreover, the proposed method outperforms ResNet, BP, and other neural network approaches in data processing across diverse working conditions due to its incorporation of a channel attention mechanism.
摘要：
Semi-supervised classification has gained widespread popularity because of their superior ability to handle unlabeled samples in practical problems. This paper has presented a novel estimation error-ranked LSSVM method with double Mahalanobis-kernel which is used for semi-supervised classification. The main point is to construct two Mahalanobis distances in Hilbert space to form double Mahalanobis-kernel by considering the relationship between the characteristics of two sorts of samples, so as to reduce the influence of non-informational dimensions. Furthermore, the implementation of the proposed method is required to solve the label security problem of unlabeled samples. The unlabeled sample with the minimum evaluated error is selected for labeling, which effectively ensures the accuracy of the unlabeled sample labeling. This method not only considers the similarity of sample features, but also focuses on the security of unlabeled samples. And based on the experimental results of four artificial data sets and several UCI data sets, it verifies the effectiveness of the semi-supervised method with double Mahalanobis-kernel. Especially considering the experimental results of five disease diagnosis data sets, it demonstrates the potential of the proposed semi-supervised classification method in medical diagnosis.
作者机构：
[Liu, Botao; Tu, Zhengge; Liu, BT] Cent China Normal Univ, Sch Econ & Business Adm, Wuhan 430079, Peoples R China.;[Liu, Botao; Tu, Zhengge; Liu, BT] Cent China Normal Univ, Res Ctr Low Carbon Econ & Environm Policies, Wuhan 430079, Peoples R China.;[Kong, Jiayang] Qinghai Univ Sci & Technol, Coll Comp & Informat Sci, Xining 810016, Peoples R China.;[Kong, Jiayang] Qinghai Univ, Dept Comp Technol & Applicat, Xining 810016, Peoples R China.;[Sun, Liping] Shandong Normal Univ, Audit Off, Jinan 250014, Peoples R China.
通讯机构：
[Liu, BT ] C;Cent China Normal Univ, Sch Econ & Business Adm, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Res Ctr Low Carbon Econ & Environm Policies, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.
关键词：
digital economy;entropy method;internet development;regional development imbalance;rural-urban income gap
摘要：
Currently, the Chinese government is considering two major strategies, namely, developing the digital economy and achieving common prosperity, to address regional development imbalances. Using panel data from 276 Chinese cities spanning from 2011 to 2019, the article first employs the entropy method to measure China’s digital economy development, digital fusion application, and Internet accessibility. Subsequently, the paper evaluates the influence of the digital economy on regional development imbalances, focusing on the rural-urban income gap. The results show a significant reduction in the rural-urban income gap due to digital economy development. Notably, digital fusion applications have a greater impact on reducing the rural-urban income gap than Internet accessibility. In addition, a heterogeneity analysis reveals that the influence of the digital economy on the rural-urban income gap is only reflected in the eastern and western regions, with a more substantial effect observed in the western region. This study, to some extent, helps Chinese government officials distinguish the diverse impacts of different dimensions and regional variations in digital economies on the rural-urban income gap. Such insights can guide the government in strategically advancing digital economy development to accelerate the mitigation of regional disparities and achieve sustainable economic development.
摘要：
To fully harness the potential of laccase in the efficient decolorization and detoxification of single and mixed dyes with diverse chemical structures, we carried out a systematic study on the decolorization and detoxification of single and mixed dyes using a crude laccase preparation obtained from a white-rot fungus strain, Pleurotus eryngii. The crude laccase preparation showed efficient decolorization of azo, anthraquinone, triphenylmethane, and indigo dyes, and the reaction rate constants followed the order Remazol Brilliant Blue R > Bromophenol blue > Indigo carmine > New Coccine > Reactive Blue 4 > Reactive Black 5 > Acid Orange 7 > Methyl green. This laccase preparation exhibited notable tolerance to SO(4)(2-) salts such as MnSO(4), MgSO(4), ZnSO(4), Na(2)SO(4), K(2)SO(4), and CdSO(4) during the decolorization of various types of dyes, but was significantly inhibited by Cl(-) salts. Additionally, this laccase preparation demonstrated strong tolerance to some organic solvents such as glycerol, ethylene glycol, propanediol, and butanediol. The crude laccase preparation demonstrated the efficient decolorization of dye mixtures, including azo + azo, azo + anthraquinone, azo + triphenylmethane, anthraquinone + indigo, anthraquinone + triphenylmethane, and indigo + triphenylmethane dyes. The decolorization kinetics of mixed dyes provided preliminary insight into the interactions between dyes in the decolorization process of mixed dyes, and the underlying reasons and mechanisms were discussed. Importantly, the crude laccase from Pleurotus eryngii showed efficient repeated-batch decolorization of single-, two-, and four-dye mixtures. This crude laccase demonstrated high stability and reusability in repeated-batch decolorization. Furthermore, this crude laccase was efficient in the detoxification of different types of single dyes and mixed dyes containing different types of dyes, and the phytotoxicity of decolorized dyes (single and mixed dyes) was significantly reduced. The crude laccase efficiently eliminated phytotoxicity associated with single and mixed dyes. Consequently, the crude laccase from Pleurotus eryngii offers significant potential for practical applications in the efficient decolorization and management of single and mixed dye pollutants with different chemical structures.
摘要：
Picolinamide fungicides, structurally related to UK-2A and antimycin-A, bind into the Qi-site in the bc(1) complex. However, the detailed binding mode of picolinamide fungicides remains unknown. In the present study, antimycin-A and UK-2A were selected to study the binding mode of picolinamide inhibitors with four protonation states in the Qi-site by integrating molecular dynamics simulation, molecular docking, and molecular mechanics Generalized Born surface area (MM/GBSA) calculations. Subsequently, a series of new picolinamide derivatives were designed and synthesized to further understand the effects of substituents on the tail phenyl ring. The computational results indicated that the substituted aromatic rings in antimycin-A and UK-2A were the pharmacophore fragments and made the primary contribution when bound to a protein. Compound 9g-hydrolysis formed H-bonds with Hie201 and Ash228 and showed an IC(50) value of 6.05 ± 0.24 μM against the porcine bc(1) complex. Compound 9c, with a simpler chemical structure, showed higher control effects than florylpicoxamid against cucumber downy mildew and expanded the fungicidal spectrum of picolinamide fungicides. The structural and mechanistic insights obtained from the present study will provide a valuable clue for the future designing of new promising Qi-site inhibitors.
摘要：
Highly efficient three‐component coupling of organic halides, sodium cyanate and amines or alcohols was achieved with a nickel/photoredox dual catalysis system. Significant N‐containing functional compounds, ureas and carbamates, were produced under green and sustainable conditions. Comprehensive Summary Ureas are widely used in drugs, materials and catalysts because of their diamide structure, which can form strong hydrogen bonds. Therefore, it is of great scientific significance to develop efficient and green methods for the synthesis of urea compounds, especially unsymmetrical ureas. Here, we have disclosed novel and highly efficient three‐component coupling reactions of organic halides, sodium cyanate and amines enabled by nickel/photoredox dual catalysis for the preparation of unsymmetrical ureas. The reaction features simple and safe operations, broad substrate scopes, and product diversities. It allows the facile synthesis of N‐aryl/vinyl ureas from readily available, user‐friendly feedstocks under mild conditions (27 examples, 36%—98% yields). In addition, this method is further derived to alcohols as nucleophiles to synthesize a series of carbamates (15 examples, 40%—95% yields). The mechanism experiment shows that the isocyanate produced by the coupling of halide and sodium cyanate may be the key intermediate in this reaction.
作者机构：
[Xing, Hongxi; Anderle, Daniele Paolo; Anderle, DP; Zhao, Yuxiang] South China Normal Univ, Inst Quantum Matter, Key Lab Atom & Subatom Struct & Quantum Control, MOE, Guangzhou 510006, Peoples R China.;[Xing, Hongxi; Anderle, Daniele Paolo; Anderle, DP] South China Normal Univ, Inst Quantum Matter, Guangdong Prov Key Lab Nucl Sci, Guangzhou 510006, Peoples R China.;[Xing, Hongxi; Anderle, Daniele Paolo; Anderle, DP] South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou 510006, Guangdong, Peoples R China.;[Guo, Aiqiang; Liang, Yutie; Ma, Yuming; Zhao, Yuxiang] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China.;[Guo, Aiqiang; Liang, Yutie; Zhao, Yuxiang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
通讯机构：
[Anderle, DP ] S;South China Normal Univ, Inst Quantum Matter, Key Lab Atom & Subatom Struct & Quantum Control, MOE, Guangzhou 510006, Peoples R China.;South China Normal Univ, Inst Quantum Matter, Guangdong Prov Key Lab Nucl Sci, Guangzhou 510006, Peoples R China.;South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou 510006, Guangdong, Peoples R China.
摘要：
The Electron -Ion Collider in China (EicC) has been proposed to study the inner structure of matter and fundamental laws of strong interactions. In this paper, we will present a conceptual design of the tracking system based on the state -of -art silicon detector and micropattern gaseous detector at the EicC and demonstrate that it will enable us to reconstruct charm hadron with good significance, hence study gluonic parton distribution functions in nucleons and nuclei, as well as gluon helicity distributions. The impact study using reweighting techniques shows that the impact of the EicC will be mainly in the large x region. It complements similar physics programs at the Electron -Ion Collider at Brookhaven National Laboratory.
通讯机构：
[Li, DF ] C;Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
摘要：
The research on electron transfer coupled spin transition regulating the valence state and spin state transition of metal ions is promising and challenging. Herein, we report a cyano-bridged {(Fe2Fe2II)-Fe-III} molecular square complex, {[Fe(Tp)(CN)(3)](2) [Fe(bnbpen)](2)}(ClO4)(2)<middle dot>8CH(3)OH (1<middle dot>8CH(3)OH, bnbpen = N,N '-bis-(2-naphthylmethyl)-N,N '-bis(2-picolayl)-ethylenediamine), and its free of solvents form (1). Combined single-crystal X-ray diffraction, temperature-dependent infrared (IR) spectra, magnetic measurements, and M & ouml;ssbauer spectra reveal that 1<middle dot>8CH(3)OH and 1 exhibit reversible one-step and two-step electron transfer coupled spin transition (ETCST) with temperature change, between the low-temperature state {Fe-II,Fe-LS(mu-CN)Fe-III,Fe-LS}(2) (LS = low spin, HS = high spin) and the high-temperature state {Fe-III,Fe-LS(mu-CN)Fe-II,Fe-HS}(2), respectively.
